> Agile is such a vague thing that it's impossible to say whether it works.

Agile methods aren't really particularly usable across orgs for the same reason prior methods weren't; the Agile Manifesto states “individuals and interactions over processes and tools”, but the Agile community is all about processes and tools at the same level, if with different content, than the processes and tools the Manifesto was talking about. How do you prioritize individuals and interactions? The Agile literature doesn't really address this. (Lean, for instance, does through higher-level processes and tools by which teams establish ownership and control of the main processes and tools, which meta-processes are subject to themselves so that he team owns the meta-process as well as the lower-level process.)